Apparatus for working glass



(No Model.)

H. D. BURNETT & S. E. DUANE.

APPARATUS FOR WORKING GLASS.

No. 520,767. Patented June 5,, 1894A.

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UNITED STATES PATENT OFFICE.

HENRY D. BURNETT, OF LYNN, AND SAMUEL EVERETT DOANE, OF SWAMP- SCOTT, MASSACHUSETTS, ASSIGNORS TO THE GENERAL ELECTRIC COM- PANY, OF NEW YORK.

SPECIFICATION forming part of Letters Patent No. 520,767, dated June 5, 1.894.

Application filed December 3, 1892. Serial No. 154,009. (No model.)

To all whom it may concern.-

Be it known that we, HENRY D. BURNETT, residing at Lynn, and SAMUEL EVERETT DOANE, residing at Swampscott, in the county of Essex and State of Massachusetts, have invented a certain new and useful Improvement in Apparatus for Working Class, of which the following is a specification.

Our invention relates to glass blowers ap- 1o pliances, and more especially to the blowpipes or fires in which the glass is heated to enable it to be worked. These fires are fed with gas and air from separate mains, and the object of our invention is to effect a I 5 saving in the gas and air, and also to expedite the work, and lessen the labor. This is accomplished by providing the gas and air pipes with stop cocks, all connected with a lever arranged to be operated by the foot or knee of the workman, so that the gas and air can be turned on or off at will. The construction is such that a small igniting flame is left burning, to light each fire when the gas is turned on. Or, an electric igniter may 2 5 be used in place of the small gas flame. An air pipe is arranged in proximity to the point where the flames converge, so that the completed article may be more rapidly cooled, if desired. A reflector of some intusible mate- 0 rial is mounted on a carrier by which it is moved to and away from the working point, either automatically when the stop cocks are operated, or independently of them.

In the drawings, Figure 1 is an elevation of 3 5 an apparatus embodying our improvements.

Fig. 2 is a plan of the fires. Fig. 3 is a section of one form of gas cook. Figs. 4., 5 and 6 show modifications of the burners. Fig. 7

shows an electric gas lighting device.

The bed or table A supports the burners B and air nozzles C. The burners and nozzles are preferably arranged in two sets of three each on opposite sides of the working point, that is, the point where the six flames con- 5 verge. The burners are of the usual T- headed shape, perforated with a number of small holes for the escape of the gas, and lying in a substantially horizontal plane. Gas is fed to the burners through a pipe B, and 5e airunder pressure is supplied to the nozzles C through a pipe C. An additional air pipe D is carried up and terminates near the point of convergence of the flames. In each pipe is a stop cock I) c d, all connected in any suitable manner with a single operating device, preferably a treadle E. By pressing down the treadle, the stopcocks are simultaneously turned. A counterweight or spring may be used to lift the treadle, or, in case the connection with the stop cocks is made by cords b c 01' running over pulleys on the stems of the cooks, a separate spring I) c 01 may be attached to each cord.

In the drawings we have shown the treadle connected with the cooks of the fires on one 6 5 side only, the other set of fires having its cocks connected with those of the first set, so as to move simultaneously therewith. The connection may be by means of endless belts F, as shown,or by any suitable devices. When the treadle is in its elevated position, as shown in Fig. 1, the air and gas are shut off from the burners and the nozzles, but the air is turned on through the cooling pipe D. When the treadle is depressed, the blast through the pipe D is shut off, and the fires are started up. Upon releasing the treadle, it rises and the air and gas are cut off from the fires, the small amount of air remaining in the pipe above the stop cock being sufficient to blow out the lingering gas flame.

To light the gas automatically, when it is again turned on, we provide a small igniting flame, located below the plane of the T-part of the burner, so as not to be blown out by the blast, inrthe manner just described, when the gas is shut off. This igniting flame is preferably fed by a small'pipe B forming a shunt around the stop cook 5 and terminating just below the inner ends of the burners. Instead of this pipe, we may constructthe burner as shown in Figs. 4, 5 or 6, with one or more gas holes drilled in a sloping or shouldered or rounded portion of the T-part, so as to be out of the line of the blast. In this case, 5 the stop cook 13' must be so made as to allow a small quantity of gas to flow through it when shut. This may be done either by having it slightly open, or by making a small passage way G around or through the plug or in its seat. Provision may be made for regulating this passage, as by means of a screw valve. In lieu of these igniting flames, an electric lighter may be used. We show in Fig. 7 a device adapted for this purpose. Adjacent to the burner are the terminals If H of a circuit from a source of electricity 1. One of the terminals, as H, is movable, and an electro-magnet K in the circuit is arranged to attract the terminal H and separate it from the terminal H, Whenever the circuitis closed by the switch L. The separation of the terminals produces a spark which lights the flame. In the device shown,the terminal H vibrates automatically so long as the switch remains closed, thus producing a series of sparks. Self-induction devices M may be introduced into the circuit to intensify the sparking.

A bed N of fire clay or other refractory material is mounted on a carrier 0, by which it can be brought under the meeting point of the flames, to reflect and concentrate the heat. The carrier may be independently movable, but We prefer to connect it, as by a cord m, with the treadle E, so that when the fires are lighted, the reflector is at the same time brought into position. \Vhen the flames are shut off the reflector recedes, thus permitting the heated glass to cool very quickly. The cooling may be greatly hastened by moving the glass slightly to bring it over the air blast pipe D. It will be seen that the glass needs only to be moved a small distance to bring it over the cooling blast pipe, so that the movements required to be made by the workman are few, and entail but little exertion, thereby enabling him to work with greater accuracy and rapidity. Our invention therefore not only effects a very large saving in gas and air, but it also enables the workman to turn out a much larger amount of work, and with less labor, than heretofore.

The apparatus is especially useful in the manufacture of incandescent electric lamps, though it is applicable to any of the uses of which such devices are capable.

What we claim as new, and desire to secure by Letters Patent, is-- 1. An apparatus for working glass which consists in a blow pipe for heating it, a reflector in proximity to the flame, valves for shutting off the flame and means for removstantially as set forth.

3. A glass blowers blow pipe provided with an air blast pipe terminating near the converging point of the flames, stop cocks in all the air and gas pipes, and a single means for operating all said cocks simultaneously, substantially as described.

4. A glass blowers blow pipe provided with an air blast pipe terminating near the converging point of the flames, stop cocks in all the air and gas pipes, and means for opening the air blast pipe cock and closing the others, or vice versa, simultaneously, substantially as set forth.

5. A glass blowers blow pipe, provided with a movable reflector, stop cocks controlling the air and gas, and means for simultaneously operating said step cocks and the reflector substantially as set forth.

6. In a glass blowers blow pipe the combination with a movable reflector, of means for removing it from the converging point of the flames, and simultaneously turning on a cooling air blast, substantially as described.

7. In a glass blowers blow pipe, the combination with a movable reflector, of means for simultaneously moving the reflectoraway from the converging point of the flames, shutting off the flames, and turning on a cooling air blast, substantially as set forth.

In testimony whereof we have hereto set our hands this 23d day of November, 1892.

HENRY D. BURNETT. SAMUEL EVERET" DOANE.

Witnesses:

J OHN W. GIBBoNEY, BENJAMIN B. HULL. 

